Internal Combustion Engines, Question Paper of B.Tech 4th Semester,Download Previous Years Question Paper 8

Roll no…..

Examination May -2014

AE-202

Internal Combustion Engines

Paper ID-A0780

Time allowed 3 hrs

Note: section A is compulsory, attempt any 4 questions from section B & Attempt any 2 questions from section C.

Section –A

1.      

a.     What is an air standard efficiency?

b.     What is scavenging?

c.      What are the functions of piston rings?

d.     What is performance number?

e.      What is carburetor?

f.       What is the difference between ‘ direct injection’ and ‘indirect injection?

g.     How is ‘engine friction defined?

h.     What are additives?

i.       Why cooling necessary for I.C. Engines?

j.       What is meant by ignition delay?

Section –B

2.     Discuss the difference between ideal and actual valve timing diagrams of a diesel engine?

3.     A diesel engine has compression ratio of 15 and heat additionat constant pressure takes place at 6% of stroke. Find the air standard efficiency of the engine. Take for air as 1.4.

4.     Explain the difference between pre-ignition, auto –ignition and detonation.

5.     Explain with a neat sketch ‘thermostat cooling’ method of cooling I.C. Engines.

6.     Explain briefly supercharging of C.I. engines,

7.      

a.     Compare the relatives advantages and disadvantages of four stroke and two stroke cycle engines.

b.     With the help of neat sketch describe the construction and working of a solex carburetor.

8.     Exoalin the combustion phenomenon of C.I. Engines and describe various phases of C.I. Engine combustion.

9.     Explain briefly the following:

a.     Direct frictional losses

b.     Valve throttling losses

c.      Combustion chamber pump loss

d.     Blowby  losses